EP0176727B1 - Verfahren zur Herstellung von kugelförmigen Brennelementen - Google Patents

Verfahren zur Herstellung von kugelförmigen Brennelementen Download PDF

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Publication number
EP0176727B1
EP0176727B1 EP85110317A EP85110317A EP0176727B1 EP 0176727 B1 EP0176727 B1 EP 0176727B1 EP 85110317 A EP85110317 A EP 85110317A EP 85110317 A EP85110317 A EP 85110317A EP 0176727 B1 EP0176727 B1 EP 0176727B1
Authority
EP
European Patent Office
Prior art keywords
furnace
binder resin
sphere
temperature
resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP85110317A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0176727A1 (de
Inventor
Hans-Joachim Becker
Werner Dr. Heit
Wilhelm Dr. Rind
Wolfgang Warzawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hobeg Hochtemperaturreaktor Brennelement GmbH
Original Assignee
Hobeg Hochtemperaturreaktor Brennelement GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hobeg Hochtemperaturreaktor Brennelement GmbH filed Critical Hobeg Hochtemperaturreaktor Brennelement GmbH
Publication of EP0176727A1 publication Critical patent/EP0176727A1/de
Application granted granted Critical
Publication of EP0176727B1 publication Critical patent/EP0176727B1/de
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C21/00—Apparatus or processes specially adapted to the manufacture of reactors or parts thereof
    • G21C21/02—Manufacture of fuel elements or breeder elements contained in non-active casings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Definitions

  • the invention relates to a method for producing spherical fuel or absorber elements for high-temperature reactors, consisting of a graphical matrix and coated particles embedded therein, by pressing a mixture of graphite press powder containing binder resin with coated nuclear fuel or absorber particles into a ball, coking the binder resin in one Furnace with gas flushing and vacuum annealing up to approx. 2000 ° C.
  • Spherical fuel or absorber elements for high temperature reactors such as. B. described in DE-PS 1909871, contain the nuclear fuel or absorber in the form of coated particles, a graphitic matrix are embedded.
  • this matrix material finely ground, highly crystalline types of natural and / or electrographite are mixed with a binder resin and further processed to a so-called graphite press powder by means of mixing or kneading processes and renewed grinding to desired grain size.
  • the coated particles are mixed with graphite powder and, if necessary, after an additional coating step in which they are coated with a 100 [.lm thick layer of pressed powder, in order to form spherical fuel elements.
  • the binder resin is then coked to carbon in a coking step, followed by cleaning and degassing of the elements, which are annealed in a vacuum at temperatures above 1600 ° C.
  • pitches and thermoplastic and thermosetting synthetic resins are possible, in particular thermoplastic and thermosetting synthetic resins based on phenol are used.
  • binder resins When these binder resins are coked, organic cracking products are produced. Furthermore, especially when thermoplastic synthetic resins or pitches are used, the binder temporarily softens during the temperature rise at the beginning of the coking process. During this phase, the dimensional stability of the fuel or absorber element compacts is reduced.
  • the compacts must be stored in such a way that their own weight means that there is no inadmissible deformation during the softening phase of the binder resin, or thermosetting binder resins must be used to maintain the shape stability.
  • the compacts can also be coked in a pusher furnace. The balls must be transported individually in a suitable boat through the furnace to prevent possible mutual contact and sticking or an inadmissible deformation. In all cases, the cracked products are removed from the coking ovens by so-called purge gases.
  • thermosetting synthetic resin is used as the binder resin.
  • This object was achieved according to the invention in that after the balls had been pressed, this binder resin was first fully cured at temperatures between 110 and 170 ° C. for at least 4 hours, and in that the balls were then coked within 2 to 10 hours to coke the binder resin pass through a furnace inclined downwards to 12 ° against the horizontal, the furnace having a temperature profile rising from the ball addition side to the ball removal side from around 100 to 800 to 1000 ° C and steeply falling from 800 to 1000 ° C to around 100 ° C, and in that Purge gas is fed from the furnace both from the ball addition side and from the ball removal side and is discharged in the furnace area at a temperature of 400 to 500 ° C on the increasing temperature profile branch.
  • a synthetic resin based on phenol and hexamethylenetetramine is preferably used as the binder resin.
  • the furnace temperature should not exceed a maximum value of 800 to 1000 ° C, whereby this temperature must be maintained over 10 to 20% of the furnace length. It has also proven to be advantageous if the furnace inclination is 3 to 10 ° with respect to the horizontal.
  • thermosetting binder resins preferably based on phenol / hexamethylenetetramine, are used and coking is preceded by a separate process step in which this binder resin, after shaping the fuel or absorber elements, initially at temperatures between
  • thermosetting binder resin of the matrix material had completely hardened
  • the special guidance of the purge gas in the coking oven also removed the non-volatile cracking products so reliably that balls stuck together or a deposit of cracked product residues in the flow channel , which would hinder the free rolling, is prevented.
  • the combined use of a hardened thermosetting binder resin with the purge gas guide described makes it possible to continuously roll balls as an uninterrupted column through the oven, the balls being able to touch each other without any problems, and to achieve high throughputs. The use of transport aids is not necessary.
  • a thousand spheres are produced using a graphite press powder which consists of 78% finely ground natural graphite / electrographite powder mixture and 22% binder resin (phenol and hexamethylene tetramine in a ratio of 5: 1 - 10: 1). After pressing, the compacts were exposed to a temperature of 150 ° C for about 4 hours, during which the binder was fully cured.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Ceramic Products (AREA)
  • Fuel Cell (AREA)
  • Catalysts (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
EP85110317A 1984-09-29 1985-08-17 Verfahren zur Herstellung von kugelförmigen Brennelementen Expired EP0176727B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843435861 DE3435861A1 (de) 1984-09-29 1984-09-29 Verfahren zur herstellung von kugelfoermigen brennelementen
DE3435861 1984-09-29

Publications (2)

Publication Number Publication Date
EP0176727A1 EP0176727A1 (de) 1986-04-09
EP0176727B1 true EP0176727B1 (de) 1988-07-13

Family

ID=6246729

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85110317A Expired EP0176727B1 (de) 1984-09-29 1985-08-17 Verfahren zur Herstellung von kugelförmigen Brennelementen

Country Status (4)

Country Link
US (1) US4666639A (enrdf_load_stackoverflow)
EP (1) EP0176727B1 (enrdf_load_stackoverflow)
JP (1) JPS6190088A (enrdf_load_stackoverflow)
DE (2) DE3435861A1 (enrdf_load_stackoverflow)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8900069B2 (en) 2010-12-28 2014-12-02 Taylor Made Golf Company, Inc. Fairway wood center of gravity projection
US20060176995A1 (en) * 2005-02-10 2006-08-10 Arizona Public Service Company Control arrangement for use with nuclear fuel
US9707457B2 (en) 2010-12-28 2017-07-18 Taylor Made Golf Company, Inc. Golf club
US8888607B2 (en) 2010-12-28 2014-11-18 Taylor Made Golf Company, Inc. Fairway wood center of gravity projection
US10639524B2 (en) 2010-12-28 2020-05-05 Taylor Made Golf Company, Inc. Golf club head
US10653926B2 (en) 2018-07-23 2020-05-19 Taylor Made Golf Company, Inc. Golf club heads
US11759685B2 (en) 2020-12-28 2023-09-19 Taylor Made Golf Company, Inc. Golf club heads

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1158641B (de) * 1960-02-24 1963-12-05 Degussa Verfahren zur Herstellung von Brennelementen fuer Kernreaktoren
DE1286228B (de) * 1964-08-07 1969-01-02 Union Carbide Corp Verfahren zur Herstellung eines Kernbrennstoffelementes
AT270831B (de) * 1964-08-07 1969-05-12 Union Carbide Corp Brennstoffelement für Kernreaktoren
FR1520232A (fr) * 1966-04-28 1968-04-05 Euratom élément de combustible nucléaire et procédé pour sa préparation
AT276583B (de) * 1967-12-07 1969-11-25 Oesterr Studien Atomenergie Höchsttemperaturbeständige Teilchen für die Kernenergieerzeugung sowie Verfahren zu deren Herstellung
GB1256033A (en) * 1969-08-06 1971-12-08 Atomic Energy Authority Uk Improvements in or relating to nuclear fuel
GB1301880A (enrdf_load_stackoverflow) * 1970-12-29 1973-01-04
DE2348282C3 (de) * 1973-09-26 1979-02-01 Hobeg Hochtemperaturreaktor-Brennelement Gmbh, 6450 Hanau Verfahren zur Herstellung von Graphitpreßpulver und Graphitpreßmassen zur Fertigung von Graphitformkörpern
JPS5324596B2 (enrdf_load_stackoverflow) * 1974-03-22 1978-07-21
US4035452A (en) * 1975-01-21 1977-07-12 General Atomic Company Method of making nuclear fuel bodies
US4073834A (en) * 1975-03-05 1978-02-14 General Atomic Company Method of making nuclear fuel elements
US4140738A (en) * 1976-03-08 1979-02-20 Hobeg Hochtemperaturreaktor-Brennelement Gmbh Process for the production of block fuel elements for high temperature reactors
JPS58191998A (ja) * 1982-05-06 1983-11-09 動力炉・核燃料開発事業団 環状槽型マイクロ波加熱装置

Also Published As

Publication number Publication date
DE3563799D1 (en) 1988-08-18
JPS6190088A (ja) 1986-05-08
US4666639A (en) 1987-05-19
JPH0546918B2 (enrdf_load_stackoverflow) 1993-07-15
DE3435861C2 (enrdf_load_stackoverflow) 1987-11-12
EP0176727A1 (de) 1986-04-09
DE3435861A1 (de) 1986-04-03

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